package web.servlet.user;

import com.fasterxml.jackson.databind.ObjectMapper;
import domain.LyyBaseResponse;
import domain.User;
import service.UserService;
import service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 根据用户名查询某个用户是否已经存在
 */
@WebServlet("/isExsist")
public class IsUserExsistServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("application/json;charset=utf-8");
        String userName = request.getParameter("userName");
        UserService userService=new UserServiceImpl();
        User user = userService.queryByUsername(userName);
        LyyBaseResponse lyyBaseResponse=new LyyBaseResponse();
        if(user!=null){//返回0表示用户已经存在，返回1表示用户未存在
            lyyBaseResponse.setStatus(0);
            lyyBaseResponse.setErrMsg("用户名已经存在！");
        }
        ObjectMapper objectMapper=new ObjectMapper();
        objectMapper.writeValue(response.getOutputStream(),lyyBaseResponse);

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
}
